diff --git a/lib/exe/indexer.php b/lib/exe/indexer.php
index 2e70b59b3b0e714d3d33f09ef8213258b8343bac..451ba97ca4b459d53d4db42134d4b4c75418d61e 100644
--- a/lib/exe/indexer.php
+++ b/lib/exe/indexer.php
@@ -25,7 +25,7 @@ if($last > @filemtime(wikiFN($ID))) sendGIF();
 
 // try to aquire a lock
 $lock = $conf['lockdir'].'/_indexer.lock';
-while(!@mkdir($lock)){
+while(!@mkdir($lock,0777)){
     if(time()-@filemtime($lock) > 60*5){
         // looks like a stale lock - remove it
         @rmdir($lock);